陰陽合同 [阴阳－－]

Jyutping jam1 joeng4 hap6 tung4
Pinyin yīn yáng hé tong

Definitions (Wiktionary)
  1. noun
    “yin-yang contracts”, i.e. two different contracts for the same work, where only the fake version with a lower payment is disclosed to tax authorities, allowing the person to evade taxes

陰陽合同 [阴阳－－]

Jyutping
Pinyin yīn yáng hé tóng

Definitions (CC-CEDICT)
  1. a deal where the parties collude to sign an under-the-table "yin contract" 陰合同|阴合同 as well as an ostensibly genuine "yang contract" 陽合同|阳合同 in order to deceive authorities